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Debt Narrative - Senior Unsecured Notes and Secured Term Loan Facility - Railcar (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 0 Months Ended | 1 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  | 1 Months Ended |  |  |  | 1 Months Ended |  |  |  |  |  |  |  |  |  | 1 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Mar. 01, 2013 Railcar Segment [Member] | Sep. 30, 2012 Railcar Segment [Member] | Jun. 30, 2014 Railcar Segment [Member] | Feb. 28, 2007 Railcar Segment [Member] Senior unsecured notes [Member] | Jun. 30, 2014 Railcar Segment [Member] Term Loan [Member] | Dec. 31, 2013 Railcar Segment [Member] Term Loan [Member] | Dec. 01, 2012 Railcar Segment [Member] Term Loan [Member] | Jan. 31, 2014 Railcar Segment [Member] Term Loan [Member] ARI Notes due 2020 [Member] | Jun. 30, 2014 Railcar Segment [Member] Term Loan [Member] ARI Notes due 2020 [Member] | Dec. 31, 2013 Railcar Segment [Member] Term Loan [Member] ARI Notes due 2020 [Member] | Mar. 27, 2014 Railcar Segment [Member] Term Loan [Member] RCF Term Loan [Member] | Mar. 31, 2014 Railcar Segment [Member] Term Loan [Member] Class A-1 Notes [Member] | Dec. 12, 2012 Railcar Segment [Member] Term Loan [Member] Class A-1 Notes [Member] | Jun. 23, 2014 Railcar Segment [Member] Term Loan [Member] Heartland Bank Term Loan [Member] [Member] | Dec. 12, 2012 Railcar Segment [Member] Term Loan [Member] Class A-2 Notes [Member] | Jun. 25, 2014 Railcar Segment [Member] Term Loan [Member] Class 2014 A-1 Notes [Member] | Jun. 25, 2014 Railcar Segment [Member] Term Loan [Member] Class 2014 A-2 Notes [Member] | Dec. 31, 2013 ARL [Member] Railcar Segment [Member] Revolving Credit Facility [Member] | Jul. 12, 2013 ARL [Member] Railcar Segment [Member] Revolving Credit Facility [Member] | Jun. 08, 2011 ARL [Member] Railcar Segment [Member] Revolving Credit Facility [Member] | Jan. 04, 2011 ARL [Member] Railcar Segment [Member] Revolving Credit Facility [Member] | Feb. 02, 2006 ARL [Member] Railcar Segment [Member] Revolving Credit Facility [Member] | Feb. 28, 2014 New ARL [Member] [Member] Railcar Segment [Member] | Jan. 31, 2014 New ARL [Member] [Member] Railcar Segment [Member] NCF I Term Loan [Member] | Jan. 31, 2014 New ARL [Member] [Member] Railcar Segment [Member] NCF II Term Loan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  | $ 275 |  |  |  |  |  |  | $ 300 |  | $ 110 | $ 12 | $ 106 | $ 175 | $ 150 | $ 47 |  |  |  |  |  | $ 250 | $ 135
Draw on term loan, initial draw |  |  |  |  |  |  |  |  | 98 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  | 195 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73 | 120 | 130 | 110 | 40 |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest reserve amount |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pledged assets |  |  |  |  |  |  | 309 | 217 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | 175 | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on extinguishment of debt | 162 | (5) |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing availability |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of senior unsecured notes |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future debt expected to be incurred by new capitalized entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 381 |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  | 316 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Use of portion of debt proceeds to repay other debt |  |  |  |  |  |  |  |  |  | 194 |  |  |  | 256 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Long-term debt after proceeds used to refinance prior debt |  |  |  |  |  |  |  |  |  | $ 122 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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